Rock drill



G. M. NELL ROCK DRILL June 21 1927.

Filed June 28. 192D Patented June 21, 1927.

UNITED STATES PATENT OFFICE. i

GUSTAVE M. NELL, OF DENVER, COLORADO, AYSSIGNOR TO THE DENVER ROOK DRILL MANUFACTURNG COMPANY, DENVER, C)OLOVIRIABO, A CORPORATION OF DELA.-

wenn;

f ROCK DRILL.

Application filed June 28, 1920. Serial No. 392,225.v

The presen-t invention relates to means for governing the movement of fluid-operated feeding means ior rock drills and similar machines, the object being to provide a structure that; is effective, convenient tothe operator, and compactly Vdisposed with relation of the mechanism governed.

The ypreferred embodiment of the invention is illustrated in the accompanying drawings, wherein Figure 1 is avieW partly in elevation and partly in section otv a portion of a stopper, showing the brake mechanism therefor,`

Figure 2 is a sectional view on the rline 2-2'ofl3`igure 1,

Figure 3 is a detaill cross sectional view on the line 3-3 of Figure 1,

Figure 4 is a cross sectional view enthe line 4 4 of Figure l,

Figure 5 is a detail perspective view of the friction means for governing the action of the brake,

Figure 6' is a detail longitudinal sectional view on an enlarged scale through said 'triction means, and

Figures 7 and 8 are views in elevation of two of the cooperating friction disks.

A portion of a drill actuating 'motor is shown at 7` and may be of any well known or desired construction. It is provided with the usual throttle valve` 8' having a port 9 that may be moved into registerwvith a supaly passage 10 that delivers motive fluid to i the motor 7'. VMounted" on the rear end of the motor` 7' is an extensible fluid-operated feeding means. l

ln the, embodiment disclosed, this'A feeding means consists ofja cylinder member 11, within which is located' a piston 12. The cylinder member at its inner end is provided with a head: 13 clamped between the end of said' cylinder member and a housing 14 that` is fitted against the rear head 15 of the motor 7. The housing 14'is provided with an internal chamber 16 closed at its rear end by the head 13, and at its front end by an integral end wall 17 The various parts are clamped together bythe usual' side bolts, one of which. is illustrated at 18. The piston 12- comprises a sleeve 19- having` an integral flange 2O atits inner end, and having its outer end'threaded into a tubular piston rod 21 thatisr slid'able through the fouter or rear headV 22` of the cylinder member and 33 of the rod 28.

is provided' with a stinger or spur 23. Clamped between the inner end ofthe rod 21 and the flange 20, are collars 24 and packing cups, 25. The piston is held againstrotation in the Vcylinder member by means of ribs or keys 26 formed onthe head 22 of1 the cylinder member and engaging in grooves or keyways 27 formed longitudinally in the outer sides of the tubular piston rod 21.

The brake mechanism is preferably con structed as follows. A rod 28 is rotatably mounted in the head 13, and extends longi-y tudinally within the piston rod 21, bei-ng provided with spiral grooves or threads. 29

. engaged by spiral ribs or threads 30; formed on the interior-of the sleeve 19. The outer or rear end of the rod28 is preferably provided with a collar 31 constitu-tinga guide for said end of the rod' 28. The inner end of the rod 28 is provided with a Hangs 32 located in the chamber 16'0fthel1ousing14, and said end projects beyond thek flange, being provided with a circular peripheral portion 33v and an angnlar portion 34, the latter beingpreierably seated in the integral' end 17 ot the housing. Mounted on the angular portion 34amA two sets-of friction disks, respectively designated 35 and 36. The. disks have circular peripheries and angularA openings 37 that snugly receive the angular portion 34 of the rod 28 sov that said disks 35 are rotatedV with the: rod. The disks 36 have circular openings 38 through which the angular portion 34 of the rod rotatably passes, and said disks 36 have outstandinar ears 39 engaged in vgrooves 40 in the walls of the housing 14. 'Obviously therefore these disks 36 are held against rot-ation with the rod 28. lnterposed between the lange 32 'of the r0d128 and the first of said disks, arev cam washers 41 and 42. The cam wash.- er 41 is provided on oneside with outstanding cam ribs 43, and the washer 42 has correspondingca'm grooves 44, in which said Y ribs engage. The washery 42 .is provided with an elongated opening 45, as shown in Figure 2,y that thus. permits the lateral movement of said disk 42 onthe circular portion The disk 42 furthermore is provided with an outstanding head 46 that is engagedV in the socket 47 of a plunger 48 slidably mounted in a plug 49. This plugris threaded into one side of the housing 14 and the plunger projects. therefrom into the path of an offset pressure lug 50 formed u pon an actuating handle lever 51. The lever 51 is is pivoted upon one side of the housing, as illustrated at 52, and is located in convenient relation to the usual holding handle of the machine. The socket for this holding handle is shown at in Figure 1. Motive fluid for actuating the 'feeding means is supplied from the throttle valve 8 through a port 5ft that may be brought into communication with a passageway 55 in the head 15, and said head is provided with a groove 56 in communication with a port 57 opening into the chamber 16. From said chamber' another port 58 opens into the cylinder member behind the piston.

The operation of the device may be outlined as follows: Vith the parts as shown in Figure 1, if motive fluid is admitted to the passageway 55, it will be evident thatit will pass into the chamber 16, and from thence through the port 58 into the cylinder member, operating against the piston 12, and thus moving the same outward, or if the spur 23 is against a suitable Support, moving the cylinder upwardly. This movement will cause the rod 28 to be rotated inasmuch as the piston rod 21 and piston are held against rotation by the keys 26 and there is the threaded engagement 29-80 between said piston and the rod` 28. The mechanism therefore will prevent any free or rapid movement of the feeding means by rreason of the resistance offered by the rod 28. Furthermore this resistance can be increased to any degree desired, even to the point of entirely stopping the movement of the feeding means by operating the lever 51. Such operation will move the plunger 48 inwardly, causing the lateral movement of the cam disk 42. This movement serves to effect a rearward movement of the cam disk 41, which obviously will press together the friction disks 35 and 36. As the disks 36 are held against rotation the disks 35 must turn between them. Upon the release of the handle 51 the pressure rof the motive fluid within the chamber 16 will move the plunger outwardly and return the cam disks to their normal positions, as shown in Figures 1 and 5. The passage of the fluid through the chamber furthermore serves to prevent dust and dirt accumulating therein and supplies a sufficient amount of lubricant to the parts to prevent excessive wear, while ample friction is maintained, it being understood that the lubricant is conducted in any well known manner to the apparatus through the air supply means.

`From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skill-ed in the art, without further description, 'and it will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is f 1. The combination with a tool-actuating motor, of extensible feeding means therefor including a cylinder member and a piston Vmember operating in the cylinder member,

and a bralie for the feeding means other than the motor and having a portion extending longitudinally into the piston member.

2. The combination with a tool-actuating motor, of extensible feeding means therefor, including a cylinder member and a piston member operating in the cylinder member, and a brake for the feeding means other than the motor and having a portion extending longitudinally into the piston member and having a sliding engagement therewith.

3. The combination with a tool actuating motor, of extensible feeding means therefor, including a cylinder member and a piston member operating in the cylinder member, and a brake device including an element rotatably mounted on onemember and said device having a sliding engagement with the other member and being rotated thereby.

e. The combination with a tool-actuating motor, of extensible feeding means therefor, including a cylinder' member and a piston member operating in the cylinder member,

ton member operating in the cylinder member, a brake device rotatably mounted on` one member and having a sliding engagement with the other member, means onone of the members frictionally engaging said device for resisting its rotary movement, and a device for varying such resistance.

6. The combination vwith a tool-actuating motor, of extensible Vfeeding means therefor, including av cylinder member and a piston member operating in the cylinder member, a brake for the feeding means Vhaving a rod extending into the piston member, said rod having a threaded engagement with the piston and a rotatable mounting in the cylinder member. friction devices on the rod, and means for imparting varying degrees of resistance to the friction devices.

7. The combination with a tool-actuating motor, of Vfluid operated extensible feeding means therefor comprising a cylinder inember and a piston operating in the cylinder member, a rotary device operated by the members on their relative movement, relatively rotatable friction members, certain of which are moved by the device, and means for exertingpressure against the friction members.

8. rThe combination with a tool-actuating motor, of fluid operated extensible feeding means therefor, comprisingl a cylinder member and a piston operating` on the cylinder member, a rotary device operated by the members on their relative movement, relatively rotatable friction disls, certain of which are moved by the device, others being stationary, and means for exerting varying degrees of pressure against the friction members.

9. The combination with' a tool-actuating motor, of fluid operated extensible feeding means therefor comprising` a cylinder member Xed at one end to the motor and a piston operating in the cylinder member and having a tubular rod that is movable through the free end of the cylinder member and is held against rotation therein, a

rotatable brake rod fixed against material longitudinal movement with respect to the cylinder member and extending into the piston rod, said rod having a threaded engagement with the piston, a plurality of relatively rotatable friction disks on the rod, separable cam disks for clamping the disks tightly together, and means for relatively moving the cam disks.

l0. The combination with a tool-actuating motor, of fluid operated extensible feeding means therefor, a brake mechanism for governing the movement of the feeding means, a housing in which said brake mechanism is located, and means for supplying Huid to the feeding mechanism through said housing and in contact with said' mechanism.

11. The combination with a tool-actuating motor, of fluid operated eXtensible feeding means therefor, a connection between the feeding mechanism and the motor having a chamber, a brake mechanism for the feeding means located in the chamber, and means for supplying motive fluid to the feeding means through the said chamber.

l2. The combination with a tool-actuating motor, of fluid operated telescoping feeding members, a connection between one of the members and the motor having an internal chamber, rotary friction brake mechanism in the chamber for governing the operation of the feeding members, a controlling` device including a plunger projecting from the chamber, and meansI for supply motive fluid to the feeding members through the chamber. v

13. The combination with a tool actuating motor, of eXtensible feeding means for the motor, means connecting the motor and feeding means, including a longitudinally disposed. side bolt, a brake for the feeding means, and a controlling lever for the brake fulcrumed on the side bolt.

In testimony whereof I afHX my signature.

GUsTAvE M. NELL. Y 

